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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5fa85b25a17da4b37df7e708427840b80cd8c06042f31bf6bfba5cbf9d1775d' 
  AND token = 'JPliU4NsykisJCLY9bBb8PIyWXO65xyzUX6F92jfku0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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