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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c84aed402eb6addb2d2e391aad02f92c0ba4f8ac98cf3107afe9e9290d97456' 
  AND token = 'nuNu8Yrn20Y3q/LQT3ai6Dgfk1uf8G8hQaLGXyo7Vuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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