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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffcdf4ead492d6122a1eba2b8d0b5d943c26e4acafc7635b597abaebad239956' 
  AND token = 'KapYvYhXuMEeRfy5Nlcshl+DJIvYP+vtPn9l3zZmi2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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