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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609bc662a4d7972bdedeb81d5090a4b633b3a48d309f8da9e41003719d61bd3a' 
  AND token = '1kyUD6JDns0L3zzPnJ0oQBs6nB5AloUjDzqeCtnTshA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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