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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e4f784378d24f5d75eea86e74cf0bf0fbb9542ef7ed5bf4a1c8575cc367cdd' 
  AND token = '3VuMtSAqb69dPxrqrIGjP+bsSP3JFU1GNzRrM7LDQJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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