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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f92e069e5c3343b9787e206250b9e75b0c8f2fdff1ace0460366e60bcbf8cb' 
  AND token = '4arWTp9iEKU4mZ36MLaRvkkAGj4iybvBTvEz8E8dUoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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