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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47c37aa7f377f9c7c2e3e1a279dcd354158ca2044c308097ce0feb83bdf1554' 
  AND token = 'WbZs1eAZmdVc3gNkzd4zwI892RVNSMlSPqb0bE//K7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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