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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6404c37df72986a8d4c222196f9f9338aeaeaca7d8ac4747932edb9527bdbc4' 
  AND token = 'RliCnbMf57Y3doGuZvd6xVJYLuVglMy/bEU6BDTiFlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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