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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de82b54dcc9d5546f77f9900be59f4ce9e7c3cb0f83e8d4703ae54e3813f2398' 
  AND token = 'ffdSyFze7Tcm4WtqgM000LhWnvUGXr0KxHBqySVnc2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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