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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1199a866d7879f48e817f1b8fb92d676c265180ce24b9616bc5a89b249a7521e' 
  AND token = 'Ei9mmCUIWBkXE8PJtNxw6GPYZZhjG+SXFhI4CT7Mfi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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