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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a71272c3376ca78e70ca8b56ea114f939b20a9802b9da039ab4bf3c6452498' 
  AND token = 'hsQB0RHUIm3MU81C2B9sHb1B34Cj7I9KcN1e7aHVZsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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