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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3846662c2e48155c5f1af9ab0e0e82402232669c55458e209f3b34db404580' 
  AND token = 'EKfg2Hsgk0RCCNjqM5AO63YIq5Xbrjw2IES2qkofjvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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