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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e14f940a9b13052e501d19af69e80b9202591855044c26e9bd9f758caf87bcb' 
  AND token = 'ywTds+s8XgzPm2fU9z6zkrtu2E3Eg5ljWDhMf/jnoig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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