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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d232f8a9365d2c0cce417a60aa1d53272cf7544badbff1c810d265f00e5351' 
  AND token = 'lD1ZUiZ/WTqlmwkss8489sYxs1hSfb1MrAu0ggtOEzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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