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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4ad02a7a7d794ff4ae53706ea270022c4523e1fe3c4297fd4efb5f8472f5d6' 
  AND token = 'llGxqRT8rJbYAjxsYFm3ZFVbot/0ll7DrwyJfomLbAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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