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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8ed03a34637aac5aac67632381345564d69d824b06db9f08cf7152e689e399' 
  AND token = 'oKrrILYTg9iW18o0QIFcA3atR7u42CDDTAcpFJIaFD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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