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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c27e20b636b32e6c8f41e4d4fc1b19092672b003cc59e8364e817d5030fc5e' 
  AND token = 'ssWV+WGLzmj8fY5fwCU5B90Kfg7e3K8mOYNGDSMnTz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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