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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb01698e9c9618558852a13c3c0d56a58ae101d80f760dbc2ce5f35f5110939' 
  AND token = '42rCgmWjKTTLLzTHgksr4z4LZF9Z0KY1ISrFgUmROg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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