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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5e09617f4117f82b4f298ce2d210c5cc9ec534f6a8d7a8fc7397e6ff55d0ec' 
  AND token = 'idU+t5FMlbncbKxjrfWBe3rm7ehe/jOTzXE3SF4ZJ7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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