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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92a74460f4e2a58db5772dd0f4e0f443600447e651630f4997bd4998edfa8c5' 
  AND token = 'sip7Q4soB8D7q8QWx1MQnVdQMdjM4FyvrYzNuq+XU9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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