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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8623cf61d313ed04ed528d1a04ba585dba41a054d5f7ef4fbcd1c56d445c29fb' 
  AND token = 'izRz/eMiVEfRFF5MRgBceLiFBK4IqbH1cJ4504NMkvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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