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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f94bac3019bbeb3e2b3b5f9d794afab23eb1f4cd9267032fdd5cb58183d0f5' 
  AND token = 'khDJKsl3f2J0zhv5USHrbVPpTfpxh26m59o9vkEuh5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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