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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93f5c87cf4ee3a78b17722ce090dfc5897fa8ae4d9d0a49be6b541088746ec8' 
  AND token = 'zEJK0eSk+77VTGe5wR31PIed9UtM9gDYwkXNNZDTtTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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