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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867260c132cb50e5e529efb7ef3d8fb265324e6953a2a027602165ffd902d47c' 
  AND token = 'V6zo/khAD8exyhcBvqLmZlE+z0LCMAyb007bbmZblYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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