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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c1247a630bc077858cb2481ccfc6e70bab7020be8c7665fc85c09b70f8e709' 
  AND token = 'FWS0vXzFdBXnwU6OjPMebUBdYUeNU/HW3nxUiXRA5SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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