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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8955717f3eb52de25ba5ff54476a345e1d120575fbf7e7d1f8d45d5faf268097' 
  AND token = 'kiah8Wf3yb1vWdF3U6anFjJIDuceYAScfOJFYkCbZ6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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