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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb26d61921e9fa21df7926c00f4862d68f90d2f249eb9b0d4da3b02f9ce4cc9' 
  AND token = 'LaFNJiTvOw2VBSU6ktV26aZ6b4jzpr1QxCLFlpcFPZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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