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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ca67c9e1a71347fd4cf7da3420ff93480cfa8ee7c62bc25d2e321c328145f0' 
  AND token = 'XDq/G6VRaKlrT3+GqiqaIkEYSc5kouMnVP8aO8Xl/PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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