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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50348ef336372db74e8fe91a89e4a64f2be3ee33a81af3d2c2310d7fb767d33c' 
  AND token = 'yW6//dkEoxDCWSh1FYnWFHkcOazXdJXfZKPo664QekU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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