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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd9f3c344bbc0dd3f0bf7c16900b7947ebf97f2832db582680a3e57f41d6eec' 
  AND token = '6M5bLo1gjtPJcGz12nepNdEa3iO82AAht15OE35Zbdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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