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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf67b6f7e59d1b4ae8496c8d50ccfa3af69f5465efd8bd6921e981e3fca4a1c' 
  AND token = 'Ebw7gc2Hp/0JcivDShqcgs0Km7ByP2urI4uneT6rkgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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