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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afad4f7ca4678c89ed0cc44f346f9779b788534abb8eeb7887ae120d3b88924e' 
  AND token = 'nw0mA5uZOegsHRe9icN3g3QTXcdl2RmG8MRdn1/x7L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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