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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbce48da86e9be82cfe7b86322d59638695f17779f321f01ab7df11f66569fa6' 
  AND token = 'XbEssNFiH8nRpgbiydoRgzOvB342WnrPQdq4FME4g4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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