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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e7898f6cff0032008e35d944f81681cd79ff0d62a3f76cf78383ed3be8cfd5' 
  AND token = 'kBgpWSISMf3dhDtK7jYvhcS45KTWMrzLgQrawZ0p7QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}