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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24b1eda0c851d6a56e4776ed2a0d51a7e18ddee3c95f54087ac576f2b2c3a4e' 
  AND token = '2igNmoNH/0nL/4bGBjk4mvGRzJEv4CCCTalZyUutSaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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