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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26be75c7bc526d37f35f6a2ae76e43c33841dd272ab341e6fe8092059ae2dd2a' 
  AND token = 'RonM1HfVk9cIYAKChgidWLYxXELrtpvMdDu3X7l01uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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