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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de1163a12e2d4fb2c6ab9c7b64a1ae0a7527ef6d1b52fb8f086f68b82a7d6f1' 
  AND token = 'xy3fWmh7cN6IYE3zAIpN4aY+FUsrTl431JIMjFl3w8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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