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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73e6214653b8520775a61e45d435dba7cf241703c65dc3d829da9c6bee8c73b' 
  AND token = 'LuXKHDYRIqLAxhX3GwscxsrgRY7BjiBKabnnS4L1nOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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