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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af8e06b69ee1d28a735fa153b35fc5b7fee62de180516f82d51ba00dc73bb26' 
  AND token = 'hNcwtSI3uQcb2Ku0mKVa4JyBwCzldGamdCxeuEkbUy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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