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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfa04983061e894a26a329456259bdd83b81259de67e7e894ee35a0a5e9367f' 
  AND token = 'pyGoWHiq8+awOdEozjG1PeZD1HRQTfQmJLqNooogCGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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