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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5de9be8b15c4a8a2787f7f3b3d934e51022eb248225ef4de0da035abf76316' 
  AND token = 'udrmdL9enuBlqNsK9lkVzLfZf13zK3nch+DLjYKXLTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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