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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f1d9021882a13ac6fc2e64800ba754b203c3c88389672762dadb2275d3e60e' 
  AND token = 'd8yJofO3LYqmUxHd5bVlz96SCDu843RbaG/6rDvyRUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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