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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440d31349533d10a6ec4d7256e2636f4f482155f319053ed32f90ea93b957423' 
  AND token = 'kGVbpgOR8aeFOppiF6cGZBvc7RHyaxd+1gmyh92dv8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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