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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ae503345ba7d1ced89a156131b74d7fce139a4fb569a8455ce2230cf0a7035' 
  AND token = 'qKUMmqtSghYqb13XGc4u5Ccyb86LCjR4g8RvhnH3EoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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