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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ee1cb8ff31b6d53b858f78250bda8a85a9a715fda32437a4f769e354d7d113' 
  AND token = 'VMJRFGfbRkZugzGHGp0lUzcavAnW3ZypC817D1aXw84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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