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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00014faff2568b70a92279a671f81b493f460d0c8adc1408395e078b826c27c9' 
  AND token = 'YnkH6TJdLasLottHQnvzf3+oRVpeaIppUe5FlafMBmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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