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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c670a8c6767b7e60652f7f4dbb6ca815c49fdcd70ab10890953000b6eceaa7' 
  AND token = 'xUVSxSu7eag6Fn0gPITf0Ob0VNBoXmLwEkrfrJN4F9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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