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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00dab4804c8a80b9816d33270906d9ad69d9d1299318539438781574f035393c' 
  AND token = 'p6MsP5Q2E6ifnCnFEDltUgdMgh6ELheFm3UZIb7D/vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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