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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b923c1e5cd861cb2ce726f1ba476ec32509621ab7ac18b798ef8d542a299e2' 
  AND token = 'Suih//l4Eeomwk7T799UuVye15ZS8042tZfpD68ab3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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