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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de4ef849a1c33bd9da2885e918c75f577038d9d5208900d1563dd9608ed249e' 
  AND token = 'KYD+s7HCJfwtrloM7+V5H1Qr4uc2WGwifkPXErtindo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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