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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319b20a1ac798cec622859f5bef3ddd759c0dedcafa682fd5c0299103ac9b354' 
  AND token = 'tjAhaWMTnY3hXjme8LuOz3NmVAM8WKQNJxI7OXI5gAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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