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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54f5d6587c4b12da84da47eeeb75bd940092a1bcf2624446a9b0768e12650b1' 
  AND token = '91M1CHZLdaJsOjgQi5tTpJCIPbYxUUL7zx3KVh6ydow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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