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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eeafd39b92ef072931ef6e9dce928f9efb37fd8a3ff46081a893e6d8a0ab99e' 
  AND token = 'BOOMlympGF2SS6VkDOM91Dld+cwA3ehpbmpv029S8a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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