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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86800c35aa6a6b25b30112986b538185bfb4e792ce453e843a6a828cd996931' 
  AND token = 'QiSVzXCv+PlQh05g2cQnUfsU0Yl48u6fxj/AobdzkeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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