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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc150620cb58dcc5b39d4524e7d24917213b372dc727481bcfb5fe0d6833d07' 
  AND token = 'vStcbHKPCahivf0Dh1fT/H6FWdeRn7weUwPVVJndQVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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