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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd0e61f03b5264ff3b83d6d3ecbc2b00bb452bbf0aca01bb9c4614342faa83d' 
  AND token = 'ru3aPv4WwQRUy0JXux3B8WId1zJIYycWSJ44v5WbWog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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