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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1adb2bfa2be94d6677cb5bed4ab570fae0d3c9712f77a310a38b7ee71f772443' 
  AND token = 'LazxN9BkARruPTU9Z+SoyQyViJdvQIYtE/QdCQvNQPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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