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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1bf69f1f7ba7b9b6db5304e9aae9c68214540c5dae19d7d73f7504ae6da3de' 
  AND token = 'RI8PGZHoP4FFJYOmKwcIWHPEVYA2un9XraEa1wnP3WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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