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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b25a6568629410416c7b7670b26fe13c3bfe30baa5b0a158fe37b266daa01d' 
  AND token = 'QZSCb6WIGx5zjRYs4BS6ElckoOYHLzv+fa+odWoNjzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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