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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918ade4a734d53841774c02adb66cec66ba738eaf01b0b22af5c48e04b632a06' 
  AND token = '9FujyrXVEzVfVpFXoQnY/r5+S7EDFHPEeio6ZCfchMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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