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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5c5b7467583dc90672078e827d8752e70b9a34c3790044a5c976ef5b2c8901' 
  AND token = '69J/r6f3UJZ6TJ0/kz2MrSBZPwisM7BGL7gmU8jiYpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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