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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7e8ee8a2d7da8c07e2a6dfa369eb4fbb13e30e3ea0b363b927e8ab03c9b880' 
  AND token = 'CRrXGA5Gx96wRL9mZchkz8bEM+VWhf/VgJniKsbrM6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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